| #!/bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # Translate stack dump function offsets. |
| # |
| # addr2line doesn't work with KASLR addresses. This works similarly to |
| # addr2line, but instead takes the 'func+0x123' format as input: |
| # |
| # $ ./scripts/faddr2line ~/k/vmlinux meminfo_proc_show+0x5/0x568 |
| # meminfo_proc_show+0x5/0x568: |
| # meminfo_proc_show at fs/proc/meminfo.c:27 |
| # |
| # If the address is part of an inlined function, the full inline call chain is |
| # printed: |
| # |
| # $ ./scripts/faddr2line ~/k/vmlinux native_write_msr+0x6/0x27 |
| # native_write_msr+0x6/0x27: |
| # arch_static_branch at arch/x86/include/asm/msr.h:121 |
| # (inlined by) static_key_false at include/linux/jump_label.h:125 |
| # (inlined by) native_write_msr at arch/x86/include/asm/msr.h:125 |
| # |
| # The function size after the '/' in the input is optional, but recommended. |
| # It's used to help disambiguate any duplicate symbol names, which can occur |
| # rarely. If the size is omitted for a duplicate symbol then it's possible for |
| # multiple code sites to be printed: |
| # |
| # $ ./scripts/faddr2line ~/k/vmlinux raw_ioctl+0x5 |
| # raw_ioctl+0x5/0x20: |
| # raw_ioctl at drivers/char/raw.c:122 |
| # |
| # raw_ioctl+0x5/0xb1: |
| # raw_ioctl at net/ipv4/raw.c:876 |
| # |
| # Multiple addresses can be specified on a single command line: |
| # |
| # $ ./scripts/faddr2line ~/k/vmlinux type_show+0x10/45 free_reserved_area+0x90 |
| # type_show+0x10/0x2d: |
| # type_show at drivers/video/backlight/backlight.c:213 |
| # |
| # free_reserved_area+0x90/0x123: |
| # free_reserved_area at mm/page_alloc.c:6429 (discriminator 2) |
| |
| |
| set -o errexit |
| set -o nounset |
| |
| READELF="${CROSS_COMPILE:-}readelf" |
| ADDR2LINE="${CROSS_COMPILE:-}addr2line" |
| SIZE="${CROSS_COMPILE:-}size" |
| NM="${CROSS_COMPILE:-}nm" |
| |
| command -v awk >/dev/null 2>&1 || die "awk isn't installed" |
| command -v ${READELF} >/dev/null 2>&1 || die "readelf isn't installed" |
| command -v ${ADDR2LINE} >/dev/null 2>&1 || die "addr2line isn't installed" |
| command -v ${SIZE} >/dev/null 2>&1 || die "size isn't installed" |
| command -v ${NM} >/dev/null 2>&1 || die "nm isn't installed" |
| |
| usage() { |
| echo "usage: faddr2line [--list] <object file> <func+offset> <func+offset>..." >&2 |
| exit 1 |
| } |
| |
| warn() { |
| echo "$1" >&2 |
| } |
| |
| die() { |
| echo "ERROR: $1" >&2 |
| exit 1 |
| } |
| |
| # Try to figure out the source directory prefix so we can remove it from the |
| # addr2line output. HACK ALERT: This assumes that start_kernel() is in |
| # kernel/init.c! This only works for vmlinux. Otherwise it falls back to |
| # printing the absolute path. |
| find_dir_prefix() { |
| local objfile=$1 |
| |
| local start_kernel_addr=$(${READELF} -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}') |
| [[ -z $start_kernel_addr ]] && return |
| |
| local file_line=$(${ADDR2LINE} -e $objfile $start_kernel_addr) |
| [[ -z $file_line ]] && return |
| |
| local prefix=${file_line%init/main.c:*} |
| if [[ -z $prefix ]] || [[ $prefix = $file_line ]]; then |
| return |
| fi |
| |
| DIR_PREFIX=$prefix |
| return 0 |
| } |
| |
| __faddr2line() { |
| local objfile=$1 |
| local func_addr=$2 |
| local dir_prefix=$3 |
| local print_warnings=$4 |
| |
| local func=${func_addr%+*} |
| local offset=${func_addr#*+} |
| offset=${offset%/*} |
| local size= |
| [[ $func_addr =~ "/" ]] && size=${func_addr#*/} |
| |
| if [[ -z $func ]] || [[ -z $offset ]] || [[ $func = $func_addr ]]; then |
| warn "bad func+offset $func_addr" |
| DONE=1 |
| return |
| fi |
| |
| # Go through each of the object's symbols which match the func name. |
| # In rare cases there might be duplicates. |
| file_end=$(${SIZE} -Ax $objfile | awk '$1 == ".text" {print $2}') |
| while read symbol; do |
| local fields=($symbol) |
| local sym_base=0x${fields[0]} |
| local sym_type=${fields[1]} |
| local sym_end=${fields[3]} |
| |
| # calculate the size |
| local sym_size=$(($sym_end - $sym_base)) |
| if [[ -z $sym_size ]] || [[ $sym_size -le 0 ]]; then |
| warn "bad symbol size: base: $sym_base end: $sym_end" |
| DONE=1 |
| return |
| fi |
| sym_size=0x$(printf %x $sym_size) |
| |
| # calculate the address |
| local addr=$(($sym_base + $offset)) |
| if [[ -z $addr ]] || [[ $addr = 0 ]]; then |
| warn "bad address: $sym_base + $offset" |
| DONE=1 |
| return |
| fi |
| addr=0x$(printf %x $addr) |
| |
| # weed out non-function symbols |
| if [[ $sym_type != t ]] && [[ $sym_type != T ]]; then |
| [[ $print_warnings = 1 ]] && |
| echo "skipping $func address at $addr due to non-function symbol of type '$sym_type'" |
| continue |
| fi |
| |
| # if the user provided a size, make sure it matches the symbol's size |
| if [[ -n $size ]] && [[ $size -ne $sym_size ]]; then |
| [[ $print_warnings = 1 ]] && |
| echo "skipping $func address at $addr due to size mismatch ($size != $sym_size)" |
| continue; |
| fi |
| |
| # make sure the provided offset is within the symbol's range |
| if [[ $offset -gt $sym_size ]]; then |
| [[ $print_warnings = 1 ]] && |
| echo "skipping $func address at $addr due to size mismatch ($offset > $sym_size)" |
| continue |
| fi |
| |
| # separate multiple entries with a blank line |
| [[ $FIRST = 0 ]] && echo |
| FIRST=0 |
| |
| # pass real address to addr2line |
| echo "$func+$offset/$sym_size:" |
| local file_lines=$(${ADDR2LINE} -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;") |
| [[ -z $file_lines ]] && return |
| |
| if [[ $LIST = 0 ]]; then |
| echo "$file_lines" | while read -r line |
| do |
| echo $line |
| done |
| DONE=1; |
| return |
| fi |
| |
| # show each line with context |
| echo "$file_lines" | while read -r line |
| do |
| echo |
| echo $line |
| n=$(echo $line | sed 's/.*:\([0-9]\+\).*/\1/g') |
| n1=$[$n-5] |
| n2=$[$n+5] |
| f=$(echo $line | sed 's/.*at \(.\+\):.*/\1/g') |
| awk 'NR>=strtonum("'$n1'") && NR<=strtonum("'$n2'") { if (NR=='$n') printf(">%d<", NR); else printf(" %d ", NR); printf("\t%s\n", $0)}' $f |
| done |
| |
| DONE=1 |
| |
| done < <(${NM} -n $objfile | awk -v fn=$func -v end=$file_end '$3 == fn { found=1; line=$0; start=$1; next } found == 1 { found=0; print line, "0x"$1 } END {if (found == 1) print line, end; }') |
| } |
| |
| [[ $# -lt 2 ]] && usage |
| |
| objfile=$1 |
| |
| LIST=0 |
| [[ "$objfile" == "--list" ]] && LIST=1 && shift && objfile=$1 |
| |
| [[ ! -f $objfile ]] && die "can't find objfile $objfile" |
| shift |
| |
| DIR_PREFIX=supercalifragilisticexpialidocious |
| find_dir_prefix $objfile |
| |
| FIRST=1 |
| while [[ $# -gt 0 ]]; do |
| func_addr=$1 |
| shift |
| |
| # print any matches found |
| DONE=0 |
| __faddr2line $objfile $func_addr $DIR_PREFIX 0 |
| |
| # if no match was found, print warnings |
| if [[ $DONE = 0 ]]; then |
| __faddr2line $objfile $func_addr $DIR_PREFIX 1 |
| warn "no match for $func_addr" |
| fi |
| done |